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Author: Amir Naoum Hanna
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 36
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Book Description
"This digest summarizes the findings from NCHRP Project 4-20C, 'Aggregate Tests Related to Performance of Portland cement concrete Pavements: State of the Knowledge.' It was prepared by Dr. Amir N. Hanna ... from the contractor's final report authored by Dr. Kevin J. Folliard and Mr. Kurt D. Smith ..."--Page 1
Author: Amir Naoum Hanna
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 36
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Book Description
"This digest summarizes the findings from NCHRP Project 4-20C, 'Aggregate Tests Related to Performance of Portland cement concrete Pavements: State of the Knowledge.' It was prepared by Dr. Amir N. Hanna ... from the contractor's final report authored by Dr. Kevin J. Folliard and Mr. Kurt D. Smith ..."--Page 1
Author: Richard C. Meininger
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 172
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Book Description
ODOT is continually searching for ways to improve the cost efficiency of Portland cement concrete without sacrificing concrete strength and stiffness. Because Portland cement is easily the most costly material used in normal concrete, limiting the amount of cement used is the quickest way to achieve cost effectiveness. In addition, limiting the cement content will also help to prevent dimensional instabilities in concrete such as shrinkage and creep. The use of larger sized coarse aggregates may be useful in limiting cement content, yet larger sized coarse aggregates may also decrease concrete strength by weakening the aggregate-cement paste bond. In many transportation structures, such as pavements, concrete strength is not critical, as dimensional stability, porosity, and durability play a more important role. It is possible, therefore, that larger sized coarse aggregates can reduce the cement content and improve these properties. Laboratory research is needed to determine if larger sized coarse aggregates can improve cement efficiency without reducing concrete strength.
Author: Mikael P. J. Olsen
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 70
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Book Description
A study was conducted to determine the mechanisms involved in the Iowa Pore Index Test and investigate ways to modify and supplement the testing procedure to increase its accuracy and sensitivity. In the study a modified IPIT was developed which utilized chamber pressures up to 1379 kPa (200 psi). Instead of using the volume of water entering the aggregate cores over a specified time period the degree of saturation which occurred in the aggregates at various chamber pressures was used. Relationships between degree of saturation and chamber pressure were developed and found to provide a general index of the aggregate freeze-thaw durability properties.
Author: Allen L. Cooley
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 106
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Book Description
Based upon the work conducted in this study, it was concluded the recycled portland cement concrete pavements are available as an option for the construction of gravel cushion and aggregate base course layers.
Author: Fulton Keller Fears
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 98
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Book Description
Author: American Concrete Paving Association. Materials and Mix Design Technical Subcommittee
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 28
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Book Description
Author: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 128
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Book Description
Author: Woodrow J. Halstead
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 60
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Book Description
This synthesis will be of interest to materials and construction engineers, and others interested in the use of rapid test methods for asphalt concrete and portland cement concrete. Information is provided on the various test methods in use for process control and acceptance of these materials, as well as methods under development. State experience with these procedures, as well as discussions from the literature, are presented. There is growing use of rapid test methods for asphalt concrete and portland cement concrete in highway construction. This report of the Transportation Research Board describes the current state of the practice with respect to the use of rapid test methods for these materials. Experience with short-cut and rapid test procedures for process control and acceptance is summarized, and a general description of the methods, their advantages and disadvantages, and their time and labor requirements are discussed based on a review of the literature and a survey of the states.
Author: Thomas John Van Dam
Publisher: Transportation Research Board
ISBN: 0309088356
Category : Technology & Engineering
Languages : en
Pages : 38
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Book Description
